Here is a selection of soundfonts I think are useful and good. I don't know what the licensing/rights are for each of these so use them at your own discretion, but I found all of these files publicly available other places on the web. I have no intention of breaching any licensing, so if you are the author of any of these soundfonts and you don't want them available here then please send me an email if you want me to remove anything: firstname.lastname@example.org
Thanks in advance to the authors of these great soundfonts.
Here are a bunch of percussion loop samples: http://ccmixter.org/files/nickleus/42766
for the following soundfonts: acoustickits 3 4 drums douglas nsk drums motown kit hs acoustic percussion ken ardency latin hand perc lo perc 2 orch battery percussion 2 percussion 3 phattkit projectsam basic percussion close projectsam basic percussion stage projectsam timpani projectsam world percussion really natural remo roland orchestral rythm roland supplementals sonic implants westgate studios all percussion
UPDATE 20130624 Uploaded percussion sets: acoustickits 3&4.sf2 Audio - Sound Font - Sonic Implants Session Drums.sf2 Drums Douglas Natural Studio Kit V2.0 (22,719KB).sf2 drums_ken_ardency.sf2 Drums Motown Kit 1 (11,070KB).sf2 HS Acoustic Percussion.sf2 latin hand perc.sf2 Lo Perc 2.sf2 nonplaced many variables (soundfonts drums) really natural remo.sf2 +orch battery.sf2 Percussion 2.sf2 Percussion 3.sf2 phattkit.sf2 projectsam_basic_percussion_close.sf2 projectsam_basic_percussion_stage.sf2 projectsam_timpani.sf2 projectsam_world_percussion.sf2 roland_orchestral_rhythm.sf2 Roland Supplementals.sf2 westgate_studios_all_percussion.sf2